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Renesas ISL9109IRZ-T
- Part No.:
- ISL9109IRZ-T
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL9109IRZ-T.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,058
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Product details
Overview
ISL9109IRZ-T from Intersil is a 1.6MHz synchronous step-down DC/DC regulator with integrated P- and N-channel MOSFETs, delivering up to 1.5A output current for RF power amplifier biasing in cellular handsets. It operates from 2.7V–5.5V input, achieves 95% peak efficiency, and features selectable forced PWM or skip mode with 22µA quiescent current in light-load operation.
For engineers reviewing the ISL9109IRZ-T datasheet, ISL9109IRZ-T pinout, ISL9109IRZ-T application, or ISL9109IRZ-T equivalent, key selection criteria include its 8-lead 2mm×3mm DFN package, 0.8V feedback reference, 100% duty cycle capability for low-dropout operation, and rapid 60µs startup enabled by STBY-controlled band-gap wake-up.
Technical Context
The ISL9109IRZ-T employs peak-current-mode PWM control with internal slope compensation and zero-cross sensing for stable regulation across load transients. Its dual-MOSFET architecture integrates a 0.16Ω P-channel high-side switch and 0.15Ω N-channel low-side switch, enabling high-efficiency conversion at 1.6MHz switching frequency.
Operation supports three distinct states: active regulation (PWM or skip mode), standby (4.3µA IQ with band-gap active), and shutdown (<1µA). Mode selection is hardware-driven via the MODE pin, while STBY enables pre-biasing of the reference for sub-60µs start-up-critical for burst-mode RF PA supply sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A maximum continuous - sufficient to drive high-power RF PAs in LTE/WCDMA handsets |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li+ cell (2.8–4.2V), 3×NiMH (3.6V), or regulated 5V rails |
| Switching Frequency | 1.35–1.75MHz typical - enables use of compact 2.2µH inductors and 10µF ceramic capacitors |
| Feedback Reference | 0.8V ±3% over temp/load/line - sets output voltage via external resistor divider (e.g., 1.8V = R1/R2 = 100k/80.6k) |
| Quiescent Current | 22µA in skip mode - maximizes battery runtime during idle PA states without sacrificing regulation accuracy |
| Duty Cycle Max | 100% - maintains regulation down to VIN = VOUT + IOUT × RDS(ON)_PCH, extending usable battery range |
| Thermal Shutdown | 160°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
ISL9109IRZ-T is housed in an 8-lead 2mm × 3mm DFN package with exposed thermal pad (L8.2x3 drawing), 0.9mm typical height, RoHS-compliant matte tin finish, and MSL3 reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–5.5V; requires local 10µF ceramic decoupling to GND |
| EN (Pin 2) | Enable control | Active-high logic; pulls output capacitor to GND when low for fast discharge |
| N/C (Pin 3) | No connect | Must be left floating - internal connection not used; floating required for proper operation |
| MODE (Pin 4) | Operating mode select | High = skip mode (low-IQ); low = forced PWM (fixed 1.6MHz) for EMI-sensitive designs |
| STBY (Pin 5) | Band-gap enable | Active-high; asserts 1ms before EN to reduce start-up time to ≤60µs |
| FB (Pin 6) | Feedback input | Monitors output via resistor divider; 0.1µA bias current limits max R2 to 200kΩ for accuracy |
| GND (Pin 7) | Power ground | Primary return path; must be tied to exposed thermal pad for thermal/electrical performance |
| SW (Pin 8) | Switch node | Connects to inductor; high dv/dt node - keep trace short and away from noise-sensitive signals |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous buck topology | Eliminates external MOSFETs and gate drivers - reduces BOM count and layout area to <1cm² |
| 100% duty cycle operation | Enables dropout as low as IOUT × 0.16Ω - extends usable battery life in deep discharge conditions |
| Soft-start with programmable timing | Configurable 1.1ms (STBY=0) or 60µs (STBY=1) ramp - prevents inrush current into PA bias networks |
| Peak current limiting & SCP | 2.1A typical current limit + FB<0.2V short-circuit detection - protects PA stage during antenna mismatch events |
| Thermal shutdown with hysteresis | 160°C trip / 125°C recovery - prevents thermal runaway while allowing graceful recovery after transient overload |
Applications
| RF Power Amplifier Supply | CPU Core Voltage Regulation |
|---|---|
Use Scenario: Providing dynamically scaled bias voltage to LTE/WCDMA front-end power amplifiers during TDD burst transmission. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying 1.5A peak current with <60µs start-up latency upon STBY/EN assertion. Use Value: Enables rapid PA activation without draining battery during idle periods, leveraging 22µA skip-mode IQ and 4.3µA standby current. | Use Scenario: Delivering tightly regulated core voltage to application processors in smartphones during DVFS transitions. IC Role / Device Role / Timing Role: High-efficiency buck regulator supporting 0.8–3.3V outputs via FB divider, with 3% output accuracy over line/load/temp. Use Value: Maintains processor stability across wide input (2.7–5.5V) and load (0–1.5A) ranges while minimizing heat generation in space-constrained modules. |
| Single Li-ion Portable Equipment | PDA & Palmtop System Power |
Use Scenario: Main system regulator in handheld medical monitors or barcode scanners powered by 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Primary 1.5A step-down converter accepting full battery voltage range (2.8–4.2V) with undervoltage lockout at 2.5V. Use Value: Delivers >90% efficiency at 500mA load while occupying minimal PCB area - critical for compact enclosures. | Use Scenario: Power management for legacy PDAs requiring multiple rail voltages (e.g., 1.8V, 2.5V, 3.3V) from a single battery. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured via external resistors per Table 1; supports 0.8V–3.3V outputs. Use Value: Reduces bill-of-materials by replacing discrete regulators with one IC capable of precise, stable output programming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency, 0.6A output, 1.8V–6.5V input, 17µA IQ in PFM mode | Lower current rating and higher minimum input limit - unsuitable for 1.5A RF PA loads | Select only for space-constrained, lower-current applications where 3MHz allows smaller passives |
| MAX17222ETA+ | 2MHz, 1.2A output, 2.0V–5.5V input, 2.5µA IQ in shutdown, no STBY pin | Lacks rapid-start band-gap prebiasing - start-up time >1ms vs. ISL9109IRZ-T's 60µs | Prefer when ultra-low shutdown IQ is critical and fast PA turn-on is not required |
Compared with TPS62231DRYR and MAX17222ETA+, the ISL9109IRZ-T uniquely balances 1.5A capability, 60µs STBY-assisted start-up, and 22µA light-load IQ - making it optimal for cellular RF PA bias where dynamic response and battery longevity are co-prioritized.
Availability
ISL9109IRZ-T is available at Aetrix Electronics and suitable for RF power amplifier supply, CPU core voltage regulation, and single Li-ion portable equipment requiring stable component supply across automotive-grade temperature ranges (-40°C to +85°C).
Supply support for ISL9109IRZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-efficiency DC/DC converters and precision analog solutions.
The ISL9109IRZ-T belongs to Intersil's RF power management product line, engineered specifically for cellular handset applications demanding rapid transient response, ultra-low quiescent current, and compact integration in battery-powered RF signal chains.
FAQ
What is the maximum output current capability of the ISL9109IRZ-T?
The ISL9109IRZ-T delivers up to 1.5A continuous output current under recommended operating conditions (TA = –40°C to +85°C, VIN = 2.7V–5.5V). This rating is validated with proper thermal management using the exposed pad and adequate PCB copper area. Peak current limit is 2.1A typical, providing margin for transient PA loads without triggering protection.
How does the STBY pin improve start-up performance in the ISL9109IRZ-T?
The STBY pin in the ISL9109IRZ-T enables the internal band-gap reference prior to EN assertion. When STBY is held high for ≥1ms before EN goes high, the ISL9109IRZ-T achieves full regulation within 60µs - critical for burst-mode RF PA applications. Without STBY prebias, soft-start takes 1.1ms, increasing latency and reducing PA efficiency in time-sensitive transmission windows.
Can the ISL9109IRZ-T operate with a 2.5V input supply?
No - the ISL9109IRZ-T has an undervoltage lockout (UVLO) threshold of 2.5V (rising) and 2.4V (falling). At 2.5V input, the device may intermittently enable/disable due to hysteresis, causing unstable regulation. The absolute minimum recommended input is 2.7V, matching the lower bound of single Li+ cell operation after initial discharge.
What is the purpose of the N/C pin on the ISL9109IRZ-T?
Pin 3 (N/C) on the ISL9109IRZ-T is a no-connect terminal with no internal connection. It must be left electrically floating - neither tied to GND nor VIN - to ensure correct internal logic operation and prevent undefined behavior. This is explicitly required in the datasheet and differs from unused pins that may be grounded.
Does the ISL9109IRZ-T support adjustable output voltage, and how is it set?
Yes, the ISL9109IRZ-T supports adjustable output voltage via the FB pin. A resistor divider (R1, R2) sets VOUT = 0.8V × (1 + R1/R2). For example, 1.8V output uses R1 = 100kΩ and R2 = 80.6kΩ (per Table 1). R2 must not exceed 200kΩ to limit error from FB pin's 0.1µA leakage current, ensuring output accuracy remains within ±3%.
ISL9109IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
ISL9109IRZ-T FAQ
1.How can I place an order for ISL9109IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9109IRZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9109IRZ-T reliable?
The price and inventory of ISL9109IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9109IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL9109IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9109IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9109IRZ-T?
ISL9109IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9109IRZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9109IRZ-T?
For technical support, including ISL9109IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9109IRZ-T requirements.
6.How does Aetrix verify that ISL9109IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9109IRZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9109IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL9109IRZ-T?
All ISL9109IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9109IRZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9109IRZ-T part is unused and in its original packaging.
Return procedure for ISL9109IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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